<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title></title>
    <style>
        html,body{
            height:100%;
        }

        body{
           background: url(images/1.jpg) no-repeat center ;
            /*background-size:100% 100%;*/
            /* 全屏背景自适应*/
            background-size: cover;
        }
    </style>
</head>
<body>

</body>
</html>